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Tri-layered Si/Co3O4/ZnO heterojunction for high-performance visible photodetec...

Domingues, Leonardo; Jayakrishnan, Ampattu R.; Kaim, Adrian; Gwozdz, Katarzyna; Istrate, Marian C.; Ghica, Corneliu; Pereira, Mario; Castro, António

ri-layered heterojunction devices based on oxide thin films are attracting significant attention for ultra-fast visible photodetection. However, the responsivity of these devices is still low. In this work, high performance photodetectors based on a tri-layered heterojunction of n-Si/p-Co3O4/n-ZnO were fabricated. Under no applied bias, a maximum responsivity and detectivity of 14.2 mA W−1 and 1.34 × 1012 Jones...


Oxygen adsorption on polar and non-polar Zn:ZnO heterostructures from first pri...

Castro, António; Calderon, Sebastian; Marques, L.

Zn:ZnO nanostructures have been studied extensively due to their potential use in many applications, such as oxygen scavengers for food packaging applications. Under atmospheric conditions, ZnO grows on the surface of Zn via an oxidation process. The mechanisms governing Zn oxidation are still not fully understood, with classical oxidation models, such as the Cabrera Mott, underestimating the oxide thickness of...


Protozoa as the “underdogs” for microbiological quality evaluation of fresh veg...

Marques, Cláudia S.; Sousa, Susana; Castro, António; Ferreira, Vânia; Teixeira, Paula; Costa, José M. Correia da

The monitoring of the microbial quality of fresh products in the industrial environment has mainly focused on bacterial indicators. Protozoa, such as Giardia duodenalis, Cryptosporidium spp., Toxoplasma gondii, and Cyclospora cayetanensis, are routinely excluded from detection and surveillance systems, despite guidelines and regulations that support the need for tracking and monitoring these pathogens in fresh ...


rTgOWP1-f, a specific biomarker for Toxoplasma gondii oocysts

Sousa, Susana; Almeida, André; Delgado, Lurdes; Conceição, Antónia; Marques, Cláudia; da Costa, José Manuel Correia; Castro, António

Toxoplasma gondii oocyst wall protein 1 (TgOWP1) integrates a family of seven proteins, consensually assumed as specific antigens of Toxoplasma gondii oocyst stage, located in the outer layer of the oocyst wall. Herein, we notice the expression of a recombinant antigen, rTgOWP1-f, derived from a fragment selected on basis of its structural homology with Plasmodium MSP1-19. Rabbit polyclonal antibodies anti-rTgO...


Detection of Toxoplasma gondii oocysts in fresh vegetables and berry fruits

Marques, Cláudia S.; Sousa, Susana; Castro, António; da Costa, José Manuel Correia

Background: Toxoplasma gondii is the third most important contributor to health burden caused by food-borne illness. Ingestion of tissue cysts from undercooked meat is an important source of horizontal transmission to humans. However, there is an increasing awareness of the consumption of fresh fruit and vegetables, as a possible source for oocyst transmission, since this stage of the parasite can persist and r...


Sequenciação de estirpes de Clostridium botulinum tipo B isoladas em Portugal

Saraiva, Margarida; Lopes, Teresa Teixeira; Castro, António; Pena, Cláudia; Bonito, Conceição Costa; Moura, Isabel Bastos; Cunha, Isabel Campos

O Clostridium botulinum é um bacilo Gram-positivo esporulado anaeróbio, produtor de neurotoxinas botulínicas (BoNT) que são causa de botulismo, uma doença neurológica que afeta humanos e animais. Com o objetivo de investigar a relação genética entre estirpes isoladas no decurso da investigação de casos de botulismo que ocorreram em Portugal, o gene codificador da toxina de 8 estirpes de Clostridium botulinum ne...


Baselines for lifetime of organic solar cells

Gevorgyan, Suren A.; Espinosa, Nieves; Ciammaruchi, Laura; Roth, Bérenger; Livi, Francesco; Tsopanidis, Stylianos; Züfle, Simon; Queirós, Sara

The process of accurately gauging lifetime improvements in organic photovoltaics (OPVs) or other similar emerging technologies, such as perovskites solar cells is still a major challenge. The presented work is part of a larger effort of developing a worldwide database of lifetimes that can help establishing reference baselines of stability performance for OPVs and other emerging PV technologies, which can then ...


Limited Knowledge About Hydatidosis Among Farmers in Northwest Portugal: A Pres...

Mateus, Teresa Letra; Niza-Ribeiro, João; Castro, António; Vieira-Pinto, Madalena

Hydatidosis is a re-emerging disease. Farmers are a vulnerable population; however, little is known about their awareness of this disease. The purpose of this study was two-fold: (1) to assess sheep and goat farmers' awareness of, perceptions of, and attitudes towards parasitic zoonoses and hydatidosis and (2) to identify the preferred means for promotion of information about hydatidosis. A cross-sectional stud...



Fusion tags for protein solubility, purification and immunogenicity in Escheric...

Costa, Sofia; Almeida, André; Castro, António; Domingues, Lucília

Proteins are now widely produced in diverse microbial cell factories. The Escherichia coli is still the dominant host for recombinant protein production but, as a bacterial cell, it also has its issues: the aggregation of foreign proteins into insoluble inclusion bodies is perhaps the main limiting factor of the E. coli expression system. Conversely, E. coli benefits of cost, ease of use and scale make it essen...


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